Method of uniting laminated materials



Sept. 2, 1930. i R. VORBAU 1,774,853

IETHOD OF UNITING LAMINATED MATERIALS Filed May 16. 1928 /nvenfor: Rebel-2* Varbau r m, 7Ma(m A IIorneys i Patented sept 2 1930 4 UNITED STATES PATENT OFFICE ROBERT VORBAU, or ORANIENBURG, NEAR BERLIN, GERMANY, AssIGNoR 'ro DEu'rscnE' GASGL'UHLICH'T-AUER-GESELLSCHAFT MIT BEscHRiNx'rER HAFTUNG, F BERLIN, GERMANY, A CQRPORATION or GERMANY METHOD Oi UNITING LAMINATED MATERIALS Application filed May 16, 1928, Serial No. 278,251, and in Germany June 16, 1927.

In the manufacture'of gas masks, gas and water tight bags, waterproof cloaks and the like, it is known to employ so called double materials or laminated fabrics. These laminated fabrics consist of two layers of fabric of the same or difierent character which are held together by means of an interposed'layer of caoutchouc or rubber. This layer of rubber renders the cloth air and waterproof and 10 serves at the same time as an adhesive. When using such laminated fabrics or when sewing that the layer of rubber present on the outside of the cloth and also the threads of the seam will be worn off through mechanical action and the material will then no longer be tight. In the following'a method of uniting two pieces of cloth is described throughwhich both pieces of cloth are connected so intimately, that they become almost one piece throughout. This method is practiced suitof cloth are put together in co-planar edge to edge or butt fashion and are then connected by means of a seam or a zigzag seam and that on both sides of the laminated material over the joint or border a strip of so-called caoutchoucrepair ribbon of suitable width is placed. The said strip of repair ribbon is pressed upon the laminated material by 40 means of any suitable device, for instance are heated to about 100 degrees cen'tigrade. At this temperature the strips of repair ribbon will become soft and they are forced between the joint of the layers of cloth and they will unite there with the layer offrubbe! situated betweenthe fabric layersand at the same time they-will cover the threads of the seam. During heating the repair ribbon is vulcanized and the said repair ribbon which of connecting the pieces has the drawback,

ably in such a manner, that the two pieces metal rails and subsequently these metal bars formerly was soft and plastic, will assume after cooling the elastic property of rubber and it will unite both pieces or layers of cloth.

In the drawing one mode of execution is illustrated in which a indicates the laminated cloth, consisting of the layers of fabric b and b and the layer of rubber or caoutchouc 0. d is the thread of the seam and the repair ribbon is designated by 6 and e a .I claim:

1. The method of uniting sheets of laminated fabric having an intermediate layer of rubber, which comprises placing the opposing edges of said-sheets in co-planar butt-joint relation,'connectingsaid sheets by a-seam, covering the seam with strips of repair ribbon'of caoutchouc, and subjecting said strips of repair ribbon to vulcanization to render the joint gas and water-tight. 2. A sheet of-laminated fabric having an intermediate layer of rubber, said sheet composed ,of two sections connected by a seamed butt joint, the seam and joint being covered by'strips of vulcanized rubber to render the jointgas and water-tight. I

In testimony whereof I aflix my signature.

. ROBERT VORBAU. 

